add Rhythm Machine project documentation

Projects/2-Intermediate/Rythem-machine.md

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+# 🎵 Rhythm Machine  
+**Tier:** 2-Intermediate  
+
+### Description
+**Rhythm Machine** is an AI-powered drum beat generator and sequencer built with **HTML, TailwindCSS, and JavaScript**.  
+It allows users to create, play, and experiment with custom drum beats or automatically generate new rhythms using AI backends such as **OpenAI**, **Gemini**, **Claude**, **LM Studio**, or **GitHub Copilot**.
+
+The purpose of this app is to give music enthusiasts and learners an interactive way to create, understand, and explore rhythm patterns with or without AI assistance.
+
+---
+
+### User Stories
+
+- User can **toggle steps** in a 16-step sequencer to build beats  
+- User can **adjust tempo** in real-time  
+- User can **select from genre presets** (Techno, Trap, Lo-Fi, etc.)  
+- User can **enter an API key** to connect with AI services  
+- User can **type a beat description** (e.g., “trap drums”) to auto-generate a rhythm  
+- User can **play, pause, and clear** the rhythm sequence  
+- User can **see the active beat step** during playback  
+
+---
+
+### Bonus Features
+
+- User can **switch between multiple AI backends** dynamically  
+- User can **use LM Studio locally** without an internet connection  
+- User can **visualize beat patterns** with animation  
+- User can **export rhythm settings** as JSON  
+- User can **see live tempo and beat indicators**  
+
+---
+
+### Useful Links & Resources
+
+- [Web Audio API Guide (MDN)](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API)  
+- [Tone.js Documentation](https://tonejs.github.io/)  
+- [TailwindCSS Documentation](https://tailwindcss.com/docs)  
+- [OpenAI API Docs](https://platform.openai.com/docs/api-reference)  
+- [Google Gemini API Docs](https://ai.google.dev/docs)  
+- [Anthropic Claude API Docs](https://docs.anthropic.com/)
+
+---
+
+### Example Projects
+
+- [Drum Machine by freeCodeCamp](https://drum-machine.freecodecamp.rocks/)